2-way ligthting - Finding the Feed


Hello all,
I have two way lighting setup and I want to find the feed (phase) wire into one of the switches. I'm using a DVM switched to AC with the backbox earth as a ground. I can't seem to find a wire that gives me a positive (240V) result! What am I doing wrong?
I also need to remove the 2-way switching from one of the switches and convert it to a regular one way light switch. anybody know the best method?
thx
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Maybe you are doing nothing wrong. You have no guarantee that the backbox is earthed.
Often the feed (phase) is at both switches on 2 way lighting on modern wiring. How many wires and of what colour are at both switches?

That will depend upon the wires available. See above
Adam
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Thanks for your help
Switch A has twin & earth both in red and a single wire also in red.
Switch B has twin & earth in blue and brown and also the single red wire.
I was using the earth wire as a ground. I also have one of those illuminating screwdrivers which lights up with quite a few of the wires!
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